381904385 has 8 divisors (see below), whose sum is σ = 464740416. Its totient is φ = 301220080.

The previous prime is 381904373. The next prime is 381904387. The reversal of 381904385 is 583409183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381904385 - 2²⁰ = 380855809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381904387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537539 + ... + 538248.

It is an arithmetic number, because the mean of its divisors is an integer number (58092552).

Almost surely, 2^381904385 is an apocalyptic number.

It is an amenable number.

381904385 is a deficient number, since it is larger than the sum of its proper divisors (82836031).

381904385 is a wasteful number, since it uses less digits than its factorization.

381904385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075863.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 381904385 is about 19542.3740881194. The cubic root of 381904385 is about 725.5236074819.

The spelling of 381904385 in words is "three hundred eighty-one million, nine hundred four thousand, three hundred eighty-five".